All right, so I know the rules about searching the forums before posting, and so I did, to no avail.

My question is this: I've got a short replay saved with which I intend to test the functionality of the motion blur...and so I've tried multiple options--shooting the video from the editor, shooting the video in the menu--and trying every codec option that I have...and every time, the game "thinks" for a while, looks like it's going to render--and then just boots me back to wherever I was before--either in the replay editor or menu. So...help? Settings: I'm using .005 duration motion blur, 196x AA, no DoF, all reflections, sharpen on, and various video resolutions. Game settings are all maxed, and HD textures are active.
tl;dr version: MT is broke and I've tried everything I can think of...
EDIT: See last post for fix if you're having problems.